App_Code/SetCookies.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
//51aspx.com 提供下载
/// <summary>
/// SetCookies 的摘要说明
/// </summary>
public class SetCookies
{
    public SetCookies()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }
    public static void SaveCookie(string CookieName, string CookieValue)
    {
        HttpCookie myCookie = new HttpCookie(CookieName);

        myCookie.Value = CookieValue;
        myCookie.Name = CookieName;
        myCookie.Expires = DateTime.Now.AddDays(100);

        HttpContext.Current.Response.Cookies.Add(myCookie);
    }
    public static string GetCookie(string CookieName)
    {
        HttpCookie myCookie = new HttpCookie(CookieName);
        myCookie = HttpContext.Current.Request.Cookies[CookieName];

        if (myCookie != null)
            return myCookie.Value;
        else
            return null;
    }

    public static void SetSession()
    {
        if (HttpContext.Current.Session["ID"] == null)
        {
            HttpContext.Current.Session["ID"] = GetCookie("username");
        }
    }
    public static void SetTeacherSession()
    {
        if (HttpContext.Current.Session["teacher"] == null)
        {
            HttpContext.Current.Session["teacher"] = GetCookie("teachers");
        }
    }
    public static void SetAdminSession()
    {
        if (HttpContext.Current.Session["admin"] == null)
        {